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OlinMemo_Template_2009 - process with labeled streams is...

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M e m o r a n d u m To: Professor Hanrath From: Olanike Green, Caroline Tabler, Alex Scharf, Monica Parrillo September 26, 2009 Re: Solar Energy Conversion Systems We have devised a solar energy collector using propane with a flow rate of 1kg/s as a working fluid to run a small-scale power generator. We made the preliminary assumptions of a Rankine cycle with 85% efficiency for both the turbine and the compressor. Using a enthalpy-pressure diagram for propane we were able to determine the temperature and pressure required of the streams. In order to generate the 25kW needed, the stream leaving the collector must be at 65 degrees C and 2MPa, and the stream leaving the turbine is at 28 degrees C and 1 MPa. A schematic diagram for our
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Unformatted text preview: process with labeled streams is shown below: QuickTimeª and a decompressor are needed to see this picture. We have also assumed that the ambient temperature is 25 degrees Celsius, and therefore the difference is 40 degrees C, giving us a flat plate collector efficiency of around 70 percent. The other two types of collectors do not offer a substantial increase in efficiency at this temperature difference. Therefore we determined that the collector must be 0.53 square meters in size in order to fulfill the energy output requirement of 25kW. In our condenser we have decided to use water as a cooling fluid, with its flow rate being 5 kg/s. cc : Tobias Hanrath...
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